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######################################################################
#
# File: b2sdk/_internal/utils/http_date.py
#
# Copyright 2019 Backblaze Inc. All Rights Reserved.
#
# License https://www.backblaze.com/using_b2_code.html
#
######################################################################
import datetime as dt
def parse_http_date(timestamp_str: str) -> dt.datetime:
# See https://datatracker.ietf.org/doc/html/rfc7231#section-7.1.1.1
# for the list of supported formats.
# We don't parse non-GTM dates because they are not valid HTTP-dates
# as defined in RFC7231 7.1.1.1. Backblaze is more premissive than
# the standard here.
http_data_formats = [
'%a, %d %b %Y %H:%M:%S GMT', # IMF-fixdate
'%A, %d-%b-%y %H:%M:%S GMT', # obsolete RFC 850 format
'%a %b %d %H:%M:%S %Y', # ANSI C's asctime() format
]
for format in http_data_formats:
try:
timestamp = dt.datetime.strptime(timestamp_str, format)
return timestamp.replace(tzinfo=dt.timezone.utc)
except ValueError:
pass
raise ValueError("Value %s is not a valid HTTP-date, won't be parsed.", timestamp_str)
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